Air purifier



FIG. 1 is a perspective view of an air purifier of the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a left side view thereof, the right side being a mirror image;

FIG. 5 is a back view thereof; and,

FIG. 6 is a top view thereof.

Any broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. 

I claim the ornamental design for an air purifier, as shown and described. 